Reversal of trend in near infrared spectroscopy [NIRS] values in a patient with carotid artery stenosis

Near Infrared Spectroscopy (NIRS) monitors continuous non-invasive regional oxygen balance within the frontal cerebral cortex. Cerebral vasoneural coupling ensures that local brain metabolism increase is met normally with augmented regional blood flow [1]. Anaesthetics agents play a vital role and so rising doses of cortical suppressant anaesthetics may increase rSO2 as oxygen consumption is decreased [2].

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